Simplicity is the major advantage of implementing hardware IP lookup engine using multi-level index tables. However, the memory efficiency of the conventional multi-level indexing approach is relatively low. In this paper we shall show that by restructuring the binary-trie using a method called bitshuffling, highly efficient index tables can be built to support the IP lookup operation. The proposed method is evaluated using a real-life IPv4 routing table with 321K prefixes. The amortized memory cost of our method is less than 3 bytes per prefix.
One of the important features of a manufacturing database is that it must be able to communicate effectively with the different elements at different levels of the manufacturing system. For instance, we need to transfer schedule instructions to certain equipment or machines to control the sequence of their operation; download NC programs to appropriate machine tools; capture real-time production data like the status of certain equipment or workin-progress etc. Therefore, in manufacturing database design we need to consider its method of communication with the equipment or other system elements and the related data structure in the database physical model. This paper presents the method of communication between an RdbNMS manufacturing database and the equipment or other elements in a CIM system via BASEstar and discusses how the data related to the equipment and elements are analysed. It also describes the mechanism for ensuring data integrity in the communication between the database system and equipment or elements of CIM system.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.